Index: uspace/srv/bd/rd/Makefile =================================================================== --- uspace/srv/bd/rd/Makefile (revision ae55ee856346e9470ad1cdba0c1e7106ce676727) +++ uspace/srv/bd/rd/Makefile (revision ae55ee856346e9470ad1cdba0c1e7106ce676727) @@ -0,0 +1,76 @@ +# +# Copyright (c) 2006 Martin Decky +# All rights reserved. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions +# are met: +# +# - Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# - Redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution. +# - The name of the author may not be used to endorse or promote products +# derived from this software without specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR +# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES +# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. +# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, +# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT +# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF +# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +# + +## Setup toolchain +# + + +LIBC_PREFIX = ../../../lib/libc +SOFTINT_PREFIX = ../../../lib/softint + +include $(LIBC_PREFIX)/Makefile.toolchain + +LIBS = $(LIBC_PREFIX)/libc.a + +## Sources +# + +OUTPUT = rd +SOURCES = \ + rd.c + +OBJECTS := $(addsuffix .o,$(basename $(SOURCES))) + +.PHONY: all clean depend disasm + +all: $(OUTPUT) $(OUTPUT).disasm + +-include Makefile.depend + +clean: + -rm -f $(OUTPUT) $(OUTPUT).map $(OUTPUT).disasm Makefile.depend $(OBJECTS) + +depend: + $(CC) $(DEFS) $(CFLAGS) -M $(SOURCES) > Makefile.depend + +$(OUTPUT): $(OBJECTS) $(LIBS) + $(LD) -T $(LIBC_PREFIX)/arch/$(UARCH)/_link.ld $(OBJECTS) $(LIBS) $(LFLAGS) -o $@ -Map $(OUTPUT).map + +disasm: $(OUTPUT).disasm + +$(OUTPUT).disasm: $(OUTPUT) + $(OBJDUMP) -d $< > $@ + +%.o: %.S + $(CC) $(DEFS) $(AFLAGS) $(CFLAGS) -D__ASM__ -c $< -o $@ + +%.o: %.s + $(AS) $(AFLAGS) $< -o $@ + +%.o: %.c + $(CC) $(DEFS) $(CFLAGS) -c $< -o $@ Index: uspace/srv/bd/rd/rd.c =================================================================== --- uspace/srv/bd/rd/rd.c (revision ae55ee856346e9470ad1cdba0c1e7106ce676727) +++ uspace/srv/bd/rd/rd.c (revision ae55ee856346e9470ad1cdba0c1e7106ce676727) @@ -0,0 +1,239 @@ +/* + * Copyright (c) 2007 Michal Konopa + * Copyright (c) 2007 Martin Jelen + * Copyright (c) 2007 Peter Majer + * Copyright (c) 2007 Jakub Jermar + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * - Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * - Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * - The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/** @addtogroup rd + * @{ + */ + +/** + * @file rd.c + * @brief Initial RAM disk for HelenOS. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define NAME "rd" + +/** Pointer to the ramdisk's image. */ +static void *rd_addr; +/** Size of the ramdisk. */ +static size_t rd_size; + +/** + * This futex protects the ramdisk's data. + * If we were to serve multiple requests (read + write or several writes) + * concurrently (i.e. from two or more threads), each read and write needs to be + * protected by this futex. + */ +atomic_t rd_futex = FUTEX_INITIALIZER; + +/** Handle one connection to ramdisk. + * + * @param iid Hash of the request that opened the connection. + * @param icall Call data of the request that opened the connection. + */ +static void rd_connection(ipc_callid_t iid, ipc_call_t *icall) +{ + ipc_callid_t callid; + ipc_call_t call; + int retval; + void *fs_va = NULL; + off_t offset; + size_t block_size; + size_t maxblock_size; + + /* + * Answer the first IPC_M_CONNECT_ME_TO call. + */ + ipc_answer_0(iid, EOK); + + /* + * Now we wait for the client to send us its communication as_area. + */ + int flags; + if (ipc_share_out_receive(&callid, &maxblock_size, &flags)) { + fs_va = as_get_mappable_page(maxblock_size); + if (fs_va) { + (void) ipc_share_out_finalize(callid, fs_va); + } else { + ipc_answer_0(callid, EHANGUP); + return; + } + } else { + /* + * The client doesn't speak the same protocol. + * At this point we can't handle protocol variations. + * Close the connection. + */ + ipc_answer_0(callid, EHANGUP); + return; + } + + while (true) { + callid = async_get_call(&call); + switch (IPC_GET_METHOD(call)) { + case IPC_M_PHONE_HUNGUP: + /* + * The other side has hung up. + * Answer the message and exit the fibril. + */ + ipc_answer_0(callid, EOK); + return; + case BD_READ_BLOCK: + offset = IPC_GET_ARG1(call); + block_size = IPC_GET_ARG2(call); + if (block_size > maxblock_size) { + /* + * Maximum block size exceeded. + */ + retval = ELIMIT; + break; + } + if (offset * block_size > rd_size - block_size) { + /* + * Reading past the end of the device. + */ + retval = ELIMIT; + break; + } + futex_down(&rd_futex); + memcpy(fs_va, rd_addr + offset * block_size, block_size); + futex_up(&rd_futex); + retval = EOK; + break; + case BD_WRITE_BLOCK: + offset = IPC_GET_ARG1(call); + block_size = IPC_GET_ARG2(call); + if (block_size > maxblock_size) { + /* + * Maximum block size exceeded. + */ + retval = ELIMIT; + break; + } + if (offset * block_size > rd_size - block_size) { + /* + * Writing past the end of the device. + */ + retval = ELIMIT; + break; + } + futex_up(&rd_futex); + memcpy(rd_addr + offset * block_size, fs_va, block_size); + futex_down(&rd_futex); + retval = EOK; + break; + default: + /* + * The client doesn't speak the same protocol. + * Instead of closing the connection, we just ignore + * the call. This can be useful if the client uses a + * newer version of the protocol. + */ + retval = EINVAL; + break; + } + ipc_answer_0(callid, retval); + } +} + +/** Prepare the ramdisk image for operation. */ +static bool rd_init(void) +{ + rd_size = sysinfo_value("rd.size"); + void *rd_ph_addr = (void *) sysinfo_value("rd.address.physical"); + + if (rd_size == 0) { + printf(NAME ": No RAM disk found\n"); + return false; + } + + rd_addr = as_get_mappable_page(rd_size); + + int flags = AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE; + int retval = physmem_map(rd_ph_addr, rd_addr, + ALIGN_UP(rd_size, PAGE_SIZE) >> PAGE_WIDTH, flags); + + if (retval < 0) { + printf(NAME ": Error mapping RAM disk\n"); + return false; + } + + printf(NAME ": Found RAM disk at %p, %d bytes\n", rd_ph_addr, rd_size); + + int rc = devmap_driver_register(NAME, rd_connection); + if (rc < 0) { + printf(NAME ": Unable to register driver (%d)\n", rc); + return false; + } + + dev_handle_t dev_handle; + if (devmap_device_register("initrd", &dev_handle) != EOK) { + devmap_hangup_phone(DEVMAP_DRIVER); + printf(NAME ": Unable to register device\n"); + return false; + } + + return true; +} + +int main(int argc, char **argv) +{ + printf(NAME ": HelenOS RAM disk server\n"); + + if (!rd_init()) + return -1; + + printf(NAME ": Accepting connections\n"); + async_manager(); + + /* Never reached */ + return 0; +} + +/** + * @} + */